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If you are going to show weights, you should include the weights of the rest of the system.
Air springs are progressive in spring rate. How progressive is based largely on volume and pressure of the airbag, but also airbag material and design. Instead of basically saying "it's complicated" though, how about you actually put up some relevant data of spring rate vs. travel at various base pressures. It will give people a much better idea of how this all works.
Air springs are HIGHLY developed in other markets (motocross bikes and mountain bikes for example). They have done a lot of stuff to try and reduce the progressive nature of airsprings, but ultimately, an air spring is going to be progressive in spring rate.
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